Chatty, you can not save the world. If you are that miserable, tell him about the YMCA and drive him there. If he says he is going to do himself in, tell him that's too bad because life sure is great; then drop him off.

He knows exactly what buttons to push and is using emotional blackmail to stay there. How long has this been going on? A long time...and he hasn't harmed himself yet. If he is helping pay the bills as you say, then that's one thing, but if he isn't...why is he there?

You are not responsible for another person's happiness. They are.